"World Government" is one of those ideas that may possibly sound appealing to some people, but it's like many abstractions in that it sounds
like a good thing that nobody could have a problem with. Like the word 'unity"...it's a word that doesn't mean much if it's not in context, and dangerous because of that. The word "balance" also...people see it as positive but it actually is rather meaningless without context.
So, no, I don't see the need to have a world government. It may just sound good but we never really need it.